New superconduting cuprates with no effective doping: T'-(La3+)2-x(RE3+)xCuO4

Details New superconduting cuprates with no effective doping: T'-(La3+)2-x(RE3+)xCuO4 New superconduting cuprates with no effective doping: T'-(La3+)2-x(RE3+)xCuO4

2004-01-08

arxiv.org/abs/cond-mat/0401120v1

Physics

Condensed Matter

Superconductivity

10 pages, 5 figures (Proceedings of the 16th international symposium on superconductivity (ISS 2003), to be published in Physi

Scientific paper

10.1016/j.physc.2011.05.026

We report the synthesis of new superconducting cuprates T'-La2-xRExCuO4 (RE = Sm, Eu, Tb, Lu, and Y) using molecular beam epitaxy. The new superconductors have no effective dopant, at least nominally. The substitution of isovalent RE for La was essentially performed to stabilize the T' phase of La2CuO4 instead of the T phase. The maximum Tconset is ~ 25 K and Tczero is ~ 21 K. The keys to our discovery are (1) the preparation of high-crystalline-quality La-based T' films by low-temperature (~ 650C) thin film processes, and (2) more thorough removal of impurity oxygen at the apical site, which is achieved by the larger in-plane lattice constant (a0) of T'-La2-xRExCuO4 than other T'-Ln2CuO4 (Ln = Pr, Nd, Sm, Eu, Gd) with the aid of large surface-to-volume ratio of thin films.

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